The question about the humidifiers is secondary, but related, to the presenting problem "to combat some severe sinus issues".
My wife and I, both, experience Wintertime related sinus issues (drying-out, nosebleeds, increased sensitivity to allergens, etc.).
The level of humidity needed to sufficiently combat the sinus issues of a person would be problematic for everything else; therefore, it's better to treat the person rather than create the ideal environment (or, for example, create the ideal environment in the bathroom and "hang-out" there, lol).
Recommendations for "treating the person" is beyond the scope of the HI/SE.